"BIG & Little" proves good things come in small - and gigantic - packages. ANTIQUES ROADSHOW looks high and low through its archive of appraisals for unusually teeny treasures and outsize objects, from an heirloom five-carat diamond ring valued at $40,000 to $50,000 to a wall-sized painting by noted American artist John Fery, estimated to be worth $20,000 to $30,000.